SN74ALS620ADW

Buffers, Drivers, Receivers, Transceivers Overview

The SN74ALS620ADW is an octal bus transceiver from the ALS logic family, designed for asynchronous two-way communication between data buses. It features a dual-output-enable configuration (OEAB and OEBA) that allows flexible timing control and local bus-latch capability by simultaneously enabling both inputs. The device provides three-state inverting outputs and operates within a supply voltage range of 4.5 V to 5.5 V. It supports low-level output currents up to 24 mA and high-level output currents up to -15 mA. Propagation delays are specified with maximum values of 10 ns for data paths and 25 ns for enable/disable transitions under standard load conditions.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Dual-output-enable configuration allowing independent or simultaneous control of data flow direction between A and B buses.
• Local bus-latch capability achieved by enabling both output-enable inputs while other bus sources remain in a high-impedance state.
• Three-state inverting outputs providing effective isolation when disabled.

Buffers, Drivers, Receivers, Transceivers Applications

• Asynchronous two-way communication between data buses
• Bus-oriented memory and logic implementations
• Local bus-latch applications

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific ordering suffix against the manufacturer's Package Option Addendum to confirm the package type and material specifications. Ensure the component status is listed as Active Production for current availability. Confirm RoHS compliance and lead finish details match the design requirements. Check moisture sensitivity level ratings if surface-mount assembly processes are utilized.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component for designs requiring octal bidirectional data transfer with inverting logic characteristics. The ALS series offers improved speed and power consumption compared to standard TTL. Verify that the required propagation delay and drive current capabilities align with the system's electrical constraints. Consider the SOIC package dimensions for PCB layout compatibility.

Buffers, Drivers, Receivers, Transceivers Part Context

This device belongs to the Texas Instruments SN74ALS620A family of octal bus transceivers. It is part of the Advanced Low-Power Schottky (ALS) logic series, which provides faster switching speeds and lower power dissipation than standard 74LS devices. The family includes variants with true and open-collector outputs, such as the SN74ALS621A and SN74ALS623A.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

SN74ALS621ADW

Buffers, Drivers, Receivers, Transceivers FAQ

How does the SN74ALS620ADW achieve local bus-latch functionality?

By simultaneously enabling both the OEAB and OEBA inputs while all other data sources to the bus lines are in a high-impedance state, the device reinforces its input, causing both sets of bus lines to retain their last states.

What is the logic polarity of the SN74ALS620ADW outputs?

The SN74ALS620ADW features three-state inverting outputs, meaning the codes appearing on the two sets of buses are complementary.